The attacks came hours before Sharif returned with his daughter Maryam, to face 10 years in prison on corruption charges.

Maryam Sharif faces seven years in jail.

He was taken into custody but is expected to appeal his sentence and seek bail.

Mr Raisani was killed when a suicide bomber blew himself up at a rally amid scores of supporters.

Islamic State claimed responsibility for the attack in a statement to its news agency, but gave no reason for bombing Mr Raisani.

He was running for election for the Baluchistan Awami Party and is the brother of the former chief minister, Aslam Raisani.

Caretaker home minister Agha Umar Bungalazi said 300 people were wounded in the bombing.

Mr Sharif flew into Lahore from London, where he was visiting his ailing wife when he was convicted of corruption.

His son-in-law is currently serving his one year prison sentence on the same charge, which stems from the purchase of luxury apartments in Britain, which were found to have been bought with illegally acquired money.

Police swept through Lahore arresting Mr Sharif’s supporters, who turned out to greet them at the airport.

Barricades and barbed wire were placed across roads toward the airport to prevent crowds.

Mr Sharif has been banned from participating in politics, and his brother Shahbaz is now the head of the Pakistan Muslim League, running for re-election on 25 July.

Mr Sharif has encouraged people to continue supporting the party and said he is not afraid of prison.